Valve-grinding device



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VALVE GRINDING DEVICE. I APPLICATION FILED MAR. 25, 1921. 1,414,983, 4 Patented May 2, 1922.

2 SHEETS-SHEET I.

J. M.- HAMILTON.

VALVE GRINDING DEVICE.

APPLICATION man 3.25. 1921.

1 ,41 4,983. 7 Patented May 2, 1922.

2 SHEETS-SHEET 2.

STATES JOE in. HAMILTON, or MOUNT HOLLY, NORTH CAROLINA.

VALVE-GRINDING nnvron.

arness.

Specification of Letters Patent.

Patented May 2, 1922.

Application filed. March 25, 1921. Serial No. 455,502.

To (ZZZ whom it may concern: I

Be it known that I, Jon M. HAMILTON, acitizen of the United States, residing at Mount Holly, in the county of Gaston and State of North Carolina, have invented certain new and useful Improvements in a Valve-Grinding Device, of which the following is a specification.

My invention relates to a device for grinding valves upon their seats, such as valves of an internal combustion engine.

An important object of the invention is to provide a device of the above mentioned character, which is adapted to impart a rotary oscillatory movement to the valve, will exert a proper pressure upon the valve, and will permit of the valve being raised from its seat, when desired.

A further object of the invention is to provide a device of the above mentioned character, which is adapted to be manually operated by a single mechanic, in a convenient manner, and which will effect a substantial saving in time.

A. further object of the invention is to provide a device of the above mentioned character, which is simple in construction, cheap to manufacture, strong and durable.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings, forming a part of the specification, and in which like numerals are employed to designate like parts throughout the same,

Fig. 1 is a side elevation of a device embodying my invention, parts being shown in section,

Fig. 2 is a horizontal section taken on line 2-2 of Figure 1',

Fig. 3.is a similar view taken on line 3-3 of Fig. 1,

Fig. 4 is a longitudinal section taken on line 4-41 of Figure 1.

Fig. 5 is a perspective view of a tool, and,

Fig. 6 is a side elevation of a modified form of the device, and,

Fig. 7 is a perspective view of the handle portion of the frame and operating shaft, showing the same separated, with parts broken away.

In the drawings, wherein for the purpose of illustration is shown preferred embodiments of my invention, the numeral 10 (both forms) designates a frame as a whole, which is preferably formed of a metal strap orbar bent to provide an upper horizontal portion 11 and a lower horizontal portion 12, con-' nected by a vertical portion 13. The portion 12 is offset downwardly at 14, forming a lower horizontal step 15, carrying a depending vertical leg 16, provided with a horizontal shoe 17. A vertical leg 17 is secured to the vertical portion 13' by bolts 18 and car rise a horizontal shoe 19-.

The numeral 20 designates a main or operating shaft, rotatable within the openings formed in the upper horizontal portion 11 of the step 15. Collars 21 are clamped to the shaft 20, above and below the step 15, and serve to prevent longitudinal displacement of the shaft. The forward end of the shaft is preferably conical, as shown at 22, and turns in a conical seat 23, in the upper surface of the shoe 17.

The numeral 241 (in the first form) designates a handle, having a swivel connection with the shaft 20, effected by means of a bolt 25, operating in an annular groove 26.

In the second form of the device, shown in Fig. 6, the leg 17"is continued above the frame 10 in the form 'of a member'or bar 17, and this bar is bent at right angles at its upper end forming a handle 18 This handle is' provided in its lower sidewith a conical recess'l9 pivotally receiving the conical end 20 of the operating shaft. In this form, the handle 24 is dispensed with, while all other parts of the device remain identical. The horizontal handle 18 has the advantage of holding the frame 10 against displacement, in proximity to the valve.

The shaft' 20 (both forms) is provided with a serpentine groove 27 ,extending longitudinally thereof. This groove embodies a plurality of approximately \l-shaped portions, extending approximately one-half way around the periphery of the shaft.

The numeral 28 designates a reciprocatory element or handle, slidable longitudinally upon the shaft 20 and provided with an element or bolt 29, Fig. 3, projecting into the groove 27. It is obvious that by moving the slidable element or handle 29 longitudinally of the shaft, that the shaft will be given a turning movement, back and forth, in opposite directions, such turning movement being preferably for approximately onehalf of a revolution.

The numeral designates a gear, arranged between the elements 11 and 15 of the frame, and rigidly mounted upon the shaft 20. This gear has a substantial thickness. The numeral 31 designates a relatively thin co-acting gear, Figure 4E, having a screw threaded opening 32 centrally thereof. The gear 31 is in pa manent mesh with the gear 30, and a vertical shaft 33 has its lower end screw threaded'in the screw threaded opening, there being preferably a lock nut 3a. The shaft 33 is slioable within an opening 35 in the horizontal portion 11. The upper end of the shaft is screw'threaded to engage in a screw threaded opening 36 in a detachable weight 37.

The numeral 38 designates the spindle of a vrsve engaging tool, which spindle is slidable within an opening 39 in the horizontal portion 12, the upper end of the spindle being screw threaded at a0, to engage within the opening 32. The lower end of the tool 38 has a pair of lugs or teeth 41, to engage in openings or notches formed in the stem top of the valve.

The numeral 42 designates a tool. adapted to engage in the slot in the top of the valve, some valves having slots to receive the end of a screw driver. end threaded, as at as. to engage in the screw threaded opening 32.

The operation of the device is as follows:

The frame 10 is located above and near the valve to be ground, and the tool 88 is placed. in engagement with the valve. The usual grinding test is applied to the valve seat and the valve, and the weight 87 is of proper size to exert a proper downward pressure upon the valve. It is obvious that the gear 31 may be vertically adjusted or elevated. and hence the valve may be readily raised from its seat, for an inspection. without shifting the frame of the device. The frame 10 remains stationary, while the element 28 is reciprocated upwardly and downwardly, which causes a rotary reciprocatory movement of the shaft 21, which is imparted to the tool 42, through the medium of the gears 30 and 31. The valve is accordingly rotated back and forth upon the seat, as is ordinarily accomplished with a screw driver or ordinary brace.

lit is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the and that various changes in the shape, size, and arrangement of parts may be re- Sorted to without departing from the spirit The tool has its upper of the invention or the scope of the subjoined claims.

Having thus described my invention, 1 claim:

1. A valve grinding device comprising, a frame adapted to be arranged in proximity to the valve and to rest upon the engine, a substantially vertical spindle slidably mounted within the frame and adapted to be moved longitudinally with relation to the frame, a weight mounted upon the upper end of the spindle, a gear mounted upon the spindle within the frame, a substantially vertical operating shaft having a portion thereof rotatably mounted within the frame and extending substantially parallel with the spindle, said operating shaft projecting above the frame and having an operating groove, a gear mounted upon the operating shaft within the frame and being thicker than the first named gear, a handle having a swiveled connection with the upper end of the operating shaft, and a reciprocatory handle slidable upon the upper portion of the operating shaft and carrying an element to enter the operating groove.

2. A valve grinding device comprising, a substantially vertical frame including spaced upper and lower substantially horizontal portions carrying depending legs, one leg being provided with a substantially horizontal shoe having a bearing seat formed in its upper face, a substantially vertical shaft mourned within the upper and lower-\frame portions and having its lower end projecting into the bearing seat of the shoe, means to prevent longitudinal movement of the operating shaft with relation to the frame, a gear mounted upon the shaft and arranged between the frame portions, means to turn the shaft, a spindle mounted within the frame and adapted to be adjusted longitudinally with relation to the frame, said spindle carrying a valve engaging element, and a gear mounted upon the spindle between the frame members and engaging the first named gear.

3. A valve grinding device comprising a frame provided near one end With a leg which has a horizontal foot provided with a bearing. a second leg secured to the opposite end of the frame and projecting upwardly beyond the same for a substantial distance and bent transversely into a handle which has a bearing. an operating shaft rotatablv mounted within the frame and having its upper and lower ends engaging said bearings, means to turn the operating shaft, a valve engaging element rotatable within the frame, and a gearing between the oper ating shaft and valve engaging element.

.ln testimony whereof I aflix my signature.

JOE M HAMILTQN. 

